CVE-2026-20139

In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.8, 9.3.9, and 9.2.12, and Splunk Cloud Platform versions below 10.2.2510.3, 10.1.2507.8, 10.0.2503.9, and 9.3.2411.121, a low-privileged user that does not hold the "admin" or "power" Splunk roles could craft a malicious payload into the `realname`, `tz`, or `email` parameters of the `/splunkd/__raw/services/authentication/users/username` REST API endpoint when they change a password. This could potentially lead to a client‑side denial‑of‑service (DoS). The malicious payload might significantly slow page load times or render Splunk Web temporarily unresponsive.

• splunk splunk (>= 9.2.0 < 9.2.12) • splunk splunk (>= 9.3.0 < 9.3.9) • splunk splunk (>= 9.4.0 < 9.4.8) • splunk splunk (>= 10.0.0 < 10.0.2) • splunk splunk cloud platform (>= 9.3.2411 < 9.3.2411.121) • splunk splunk cloud platform (>= 10.0.2503 < 10.0.2503.9) • splunk splunk cloud platform (>= 10.1.2507 < 10.1.2507.8) • splunk splunk cloud platform (>= 10.2.2510 < 10.2.2510.3)